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TT: Fachverband Tiefe Temperaturen

TT 60: Spintronics (other effects) (joint session MA/TT)

TT 60.4: Vortrag

Mittwoch, 11. März 2026, 16:00–16:15, POT/0112

Assembly of Magnetic Heterostructures with Chiral Nanographenes — •Chi Fang, Wenhui Niu, Jitul Deka, and Stuart Parkin — Max Planck Institute of Microstructure Physics, Halle(Saale) 06120, Germany

Chirality-induced spin selectivity (CISS) is an emergent phenomenon whereby chiral molecules act as efficient spin filters, selectively transmitting electrons of a particular spin orientation. A central challenge in advancing CISS-based spintronics lies in experimentally verifying spin filtering in structurally defined, laterally extended molecular systems, using standard solid-state device techniques that yield reproducible and robust spin-dependent transport signals. Here, we present direct experimental evidence of the CISS effect in helical nanographenes (NGs), using magnetoresistance (MR) measurements in magnetic heterostructures. The device architecture included a bottom electrode ferromagnetic contact, orthogonally patterned and electrically isolated by an AlOx layer to confine current to the junctions. NG, a synthetically tailored chiral molecule, was spin-coated to form a thin, uniform layer serving as a spin-filter interface. Different from previous works, the ferromagnet layer grown directly on the substrate offers a better performance of the magnetic properties. Both enantiomeric devices showed MR values around 1 % at room temperature, with minimal variation over the 10*400 K temperature range, indicating robust and reproducible spin selectivity. [1] B. Bloom et al. Chem. Rev. 124(4), 2014;[2] S. Ham et al. Micromachines 15(4), 528, 2024;[3] S. Yang et al., Nat. Rev. Phys. 3, 328, 2021.

Keywords: chiral-induced spin selectivity; spin valve; nanographene